linux-kernel - Re: [PATCH v6] sched: do not call __put_task_struct() on rt if pi_blocked

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Message-ID: <20250811121951.GD5250@redhat.com>
Date: Mon, 11 Aug 2025 14:19:51 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: "Luis Claudio R. Goncalves" <lgoncalv@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Clark Williams <clrkwllms@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>, Tejun Heo <tj@...nel.org>,
	David Vernet <dvernet@...a.com>, Barret Rhoden <brho@...gle.com>,
	Josh Don <joshdon@...gle.com>, Crystal Wood <crwood@...hat.com>,
	linux-kernel@...r.kernel.org, linux-rt-devel@...ts.linux.dev,
	Juri Lelli <juri.lelli@...hat.com>, Ben Segall <bsegall@...gle.com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Ingo Molnar <mingo@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Wander Lairson Costa <wander@...hat.com>
Subject: Re: [PATCH v6] sched: do not call __put_task_struct() on rt if
 pi_blocked_on is set

On 08/11, Sebastian Andrzej Siewior wrote:
>
> On 2025-08-11 13:06:18 [+0200], Oleg Nesterov wrote:
> > On 08/11, Sebastian Andrzej Siewior wrote:
> > >
> > > On 2025-08-01 12:24:29 [+0200], Oleg Nesterov wrote:
> > > > s/LD_WAIT_SLEEP/LD_WAIT_CONFIG/ needs another discussion even if I am right,
> > > > sorry for the confusion.
> > >
> > > You are correct Oleg. I've been just verifying it and yes: LD_WAIT_SLEEP
> > > suppresses also mutex while the intention is to only suppress
> > > spinlock_t.
> > 
> > Good, thanks.
> > 
> > > We have four users in tree, based on quick check all four should use
> > > CONFIG, three of them do use SLEEP.
> > 
> > Yes. I'll send the simple patch when this patch from Luis is merged.
>
> Okay. Let me cover then the other instances.

I was going to update them all, but feel free to do.

Oleg.